CN104137419A - Capacitive sensor arrangement for switching a door opening in a motor vehicle and associated method - Google Patents
Capacitive sensor arrangement for switching a door opening in a motor vehicle and associated method Download PDFInfo
- Publication number
- CN104137419A CN104137419A CN201380010709.3A CN201380010709A CN104137419A CN 104137419 A CN104137419 A CN 104137419A CN 201380010709 A CN201380010709 A CN 201380010709A CN 104137419 A CN104137419 A CN 104137419A
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- load
- sensor
- capacitance
- control analysis
- analysis instrument
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
- H03K17/955—Proximity switches using a capacitive detector
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J2200/00—Indexing scheme relating to tuning resonant circuits and selecting resonant circuits
- H03J2200/10—Tuning of a resonator by means of digitally controlled capacitor bank
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/9401—Calibration techniques
- H03K2217/94031—Calibration involving digital processing
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/94052—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated with evaluation of actuation pattern or sequence, e.g. tapping
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/96—Touch switches
- H03K2217/9607—Capacitive touch switches
- H03K2217/960705—Safety of capacitive touch and proximity switches, e.g. increasing reliability, fail-safe
Abstract
A sensor arrangement for detecting motion gestures in a motor vehicle, having at least one capacitive sensor electrode (2, 3) and a control and evaluation device (4) coupled to the sensor electrode. Said control and evaluation device records a time sequence of capacitance values of the sensor electrode, wherein the control and evaluation device outputs an actuation signal on the basis of the time sequence. Coupled to the control and evaluation device is a controllable basic load subassembly (11, 12) which can be used to couple a capacitive basic load to the capacitive measurement load formed by the sensor electrode (2, 3) or to decouple said basic load from said measurement load on the basis of control, with the result that the connected basic load can be recorded, together with the measurement load, as a capacitive total load in the control and evaluation device (4). The basic load subassembly (11, 12) is controlled by the control and evaluation device on the basis of the recorded total load.
Description
Technical field
The present invention relates to a kind of sensor cluster that sensor electrode is installed, sensor electrode can measure the close object in its front.
Background technology
The transducer of the above-mentioned type uses capacitive measuring principle to distinguish and approaches object or obstacle.Form an external electrical field by second electrode.Dielectric enters into after electric field, and the condenser capacitance that described electrode forms changes.
The control analysis instrument route survey of connecting sensor electrode is to the sensor electrode capacitance variations occurring with respect to standard electrode potential, there is described sensor electrode periodic charge and the electric discharge of assigned frequency, and at least correlated current or the voltage variation parameter of described sensor electrode periodic charge and electric discharge are analyzed, thereby Detection capacitance changes.
In the time of object proximity or contact, changing appears in the condenser capacitance that described sensor electrode and object form, and described sensor electrode is also made respective reaction.Main cause is that the electric capacity of capacitor is relevant with polar plate spacing.Generally, object from sensor electrode more close to, electric capacity raise faster.
The described sensor cluster of this kind of version is at United States Patent (USP) 5,730,165 and relevant German patent DE 196 81 725 B4 in had introduction.The correlated current of sensor electrode periodic charge and electric discharge or voltage variation parameter are the voltage that can measure by capacitor, this voltage is relevant with the electric charge accumulating on capacitor, the stored charge that charges in the time that described sensor electrode is regularly connected with operating voltage, electric discharge while then connection with capacitor.In patent EP 1 339 025 B1, also introduce the patent of another kind of version.
The capacitance variations of capacitance sensor also can be thought the variation of sensor electrode capacitor charging and discharge time.For example transducer is worked according to electric charge principle of transfer.At least need the standard capacitor of a periodic charge according to the analysing electronic component of described electronics principle of transfer work, for definite charging interval and for analyzing the standard time interval that comes close to or in contact with object.The situation of change of analytical standard capacitor charge time, and adjust in the time of object proximity sensor electrode.
Miscellaneous part be installed and be connected to described sensor cluster also can, for example, other an electromotive force control electrode is installed.Can a supplemantary electrode as shielding be installed as electrical capacitance proximity sensor to described sensor cluster in order to reduce the sensitivity of disturbing and improve transducer.Described capacitance sensor is described as the clamping protection device of automobile window lifter in WO99/48730 or DE 40 36 465.On this kind of capacitance sensor, have triple electrode structure and be arranged in wire base material as sealing device parts, Patents has DE 10 2,006 053 572 B3.
Described sensor cluster is provided with the hidden electrode of ground connection at regular intervals and a bucking electrode between sensor electrode and hidden electrode after a sensor electrode and described sensor electrode, be connected with sensor electrode by control analysis instrument circuit, just meeting proximity transducer electrode potential of its electromotive force like this, at known publication EP 0 518 836 A1, US 6,825,752 B2, did introduction in DE 101 31 243 C1 and DE 10 2,006 044 778 A1.
Use the sensor electrode of this kind of version can operate car door or cover plate, for example automobile trunk cover plate.But also can use described sensor electrode to distinguish approaching object, for example, leg rocks below rear bumper handles automobile controller opening and closing boot cover plate.
The problem of above-mentioned known device is to be placed in front position with the sensor electrode of different capacitance load.The variation of environmental condition, for example salt crystallization, pollutes, and humidity or steam have influence on measurement accuracy to meeting.
Summary of the invention
The object of the present invention is to provide a kind of sensor technology reliably, reduce the situation of operation and measuring error.
According to the present invention, address this problem by a kind of method of introducing in sensor cluster with claim 1 characteristic and claim 7.
Meet in the action induction automobile sensor assembly of structure of the present invention and at least connect a capacitance sensor electrodes and a control analysis instrument with sensor electrode.The time dependent sensor electrical electrode capacitance of this measurement device, control analysis instrument can send relevant time operation signal.
Suggestion adopts the method, is switched on or switched off the electric capacity base load relevant with capacitance by control analysis instrument basis.Connect controllable base load assembly by described control analysis instrument, control this assembly and make basic capacitance load connect the capacitance measurement load that sensor electrode forms.Measuring (constant) base load of connecting loads to the total capacitance that (operating relevant) measurement load in described control analysis instrument forms.
Control analysis instrument is set base load to electrode assemblie, can measure electric capacity.While reaching the base load of setting, described control analysis instrument can be connected capacitance load, and therefore described control analysis instrument can the electric capacity of measuring transducer electrode and the capacitance load of connection.Simultaneously described sensor electrode is connected electric capacity.Described control analysis instrument is according to the total load control base load assembly of measuring.
Can change according to environmental impact electric capacity base load, for example, be provided with while there is salt crystallization in the bumper of sensor electrode, disconnect the base load of connecting, total capacitance is got back in the comprehensive analyst coverage of electrode again.
Remove salt crystallization, changing appears in total capacitance load again, can measure at any time, and electric capacity base load can again be got back to setting range in the time connecting or connect electric capacity.
The invention has the advantages that, base load assembly has different connection electric capacity base loads, is connected and is changed base load by control.
Main capacitor and the capacitor assembly of using, as electric capacity base load, can progressively change base load.Also can set multiple base load grades and connect.
Connect control analysis instrument controllable switch element and do not measure capacitance by switch element with simple method.
In general, electric capacity base load meeting temporal evolution, this process is longer than the time of sensor measurement process.Being switched on or switched off of base load electric capacity can be determined by the capacitance of measurement per minute.
Be mainly that sensor element can be worked at any time in the setting range of measuring electric capacity, and accuracy of identification is higher.
Major advantage of the present invention is, capacitor can be used as base load, in the time that combination is connected, can set wider base load scope.For example can use the capacitor of capacity ratio for 2:4:8:18 (potential energy 2), make base load mate (for example 2,4,6,8,10,12,14,16,18,20,22,24,26,28,30) with double electric capacity basic value by grouping circuits
As mentioned above, connect base load according to signal or measurement electric capacity recruitment.In basic setting, (general state under the automobile under general condition and supply of material state) can connect 14 times of basic capacitances.There is the regulated quantity that enough can improve and reduce base load.
Sensor electrode in the present invention can be arbitrary structures form, for example, and extension lead, coaxial conductor or flat electrode.This external electrode can be that multiple parts form.Sensor electrode forms by electric conducting material.
Capacitance sensor assembly of the present invention comprises that one along first first sensor electrode that also alignment extends, and measures the object of proximity transducer electrode by sensor electrode described in this.And alignment is Descartes's coherent system straight line, in space, can turn.
Sensor electrode has one deck electric insulation crust.It can protect insulator be not subject to environmental impact and do not contact with other conductive components.
The described control analysis instrument circuit of connecting can measure the sensor electrode capacity changing with respect to standard electrode potential, first has regularly electric discharge of sensor electrode and the charging of assigned frequency, and at least analyze the curtage running parameter of sensor electrode periodic charge and electric discharge described in first, thereby the variation of measuring electric capacity.The process of periodic charge and electric discharge is such, and the sensor electrode with fixed frequency regularly connects electromotive force repeatedly, for example, and operating voltage electromotive force.The variation of voltage can be the change in voltage of sensor electrode interface.This parameter is the voltage that in capacitor, accumulative total is measured when electric charge, or through the measured voltage of first sensor electrode when exceeding switch valve of charging and discharging several times repeatedly.In the time that user makes a fixing action, for example below bumper, kick, form one time switching process.Sensor electrode can distinguish whether send a time signal for this action, for example, in the time that user's shank approaches, measure user's shank, and forms the signal value of a rising.
The base load that the present invention connects is as capacitance compensation.Capacitance variations scope is very little also can make a response, and is adjustable with respect to the product base load in other patents or capacitance compensation.
Method of the present invention is to distinguish motion action automobile with sensor cluster, at least uses a capacitance sensor electrodes and a control analysis instrument being connected with sensor electrode.Described control analysis instrument can the time dependent capacitance of measuring transducer electrode, and control analysis instrument can send operation signal according to passage of time.
According to the inventive method, need to use the control analysis instrument periodic measurement electric capacity total load of connecting sensor electrode.The value that meets of setting in the electric capacity total load of measuring and control analysis instrument contrasts.
According to comparing result, total load is to be greater than or less than set point, thereby make the capacitance measurement load that electric capacity base load forms with sensor electrode be connected or disconnect, measure as (constant) base load of total capacitance and (operation of variation shows) of control analysis instrument and measure load.Select base load according to the total load of measuring, thereby the load value of total load and setting is approached.
The advantage of version of the present invention has been done further elaboration in following dependent claims.
Brief description of the drawings
Can understand in more detail with reference to the accompanying drawings the present invention
The version of the automobile sensor assembly of the present invention showing in Fig. 1;
What Fig. 2 showed is the vertical view of Fig. 1;
What Fig. 3 showed is the block diagram of sensor cluster of the present invention;
Embodiment
What in Fig. 1, show is the afterbody of automobile 1, and a sensor electrode assembly 2 is installed in the scope of afterbody bumper.It below described sensor electrode assembly 2, is another sensor electrode assembly 3 in the skew of horizontal and vertical direction.Described sensor electrode assembly 2 is being connected a control analysis instrument 4 with 3.It is arranged near electrode 2 and 3.Described analyzer 4 is connected (seeing Fig. 2) with a central automobile controller 5.Described central controller 5 obtains the signal that automobile trunk cover plate is opened from control analysis instrument 4, and described analyzer 4 can also analyzing electrode signal simultaneously.Described electrode assemblie 2,3 charges by control analysis instrument 4, and in the time of object proximity, analyzes electric charge and measure capacitance variations, for example operator's body part.
Measure each electrode 2,3 and exercise the each electric capacity between track by first capacitance sensor electrodes 2 and second capacitance sensor electrodes 3.Having there is variation in described electric capacity, for example, between electrode 2,3 and operation track, has entered an object, and control analysis instrument 4 detects the capacitance variations of each described electrode 2,3, and analyzer connects two described electrodes 2,3.
Two described electrodes 2,3 have certain distance, can analyze action, and for example the foot-propelled between automobile tail bumper and traveling lane is done.Simply do a kick action, the electrode 2,3 of parallel installation just can be opened or closed boot cover plate, and carries out complicated operation without driver.
Due to two parallel installations of electrode 2,3, two described electrodes 2,3 have formed a capacitance sensor group, distinguish operating process by the action of two different directions.First element (action inwardly) skirt below automobile tail bumper, second action (drawing back action) operator's pin is regained.Apparatus of the present invention 4 are by described capacitance sensor electrodes 2,3 these actions of identification, thereby first capacitance sensor 2 and second capacitance sensor electrodes 3 are made a response, the wireless chip of automobile telegraph key or each wireless docking is made a response, by antenna that can wireless signal emission within the scope of antenna transmission of signal, especially an automobile tail.Telegraph key, within the scope of antenna reception, can send its wireless signal, and this signal can be received by automobile.Thereby open automobile trunk cover plate.
The principle of this kind of capacitance sensor is also understood by everybody in automotive engineering industry.The connection of electrode 2,3 and control analysis instrument 4 measurement and analytic signal send start signal voluntarily.
Shown in Fig. 3 is the feature that control analysis instrument 4 of the present invention has.In control analysis instrument 4, contain a microcontroller 10 and two capacitor assemblies that are connected with microcontroller 11 and 12.On described capacitor assembly 11 and 12, there is respectively the electric capacity of connection and can be connected on wire 13 and 14.Described wire 13 is connected with the input of microcontroller 10 with 14.External electrode shown in figure 2 is connected with the input of described microcontroller 10 by described wire 14, is connected by described capacitor assembly 12 with electrode that can preliminary election simultaneously.Sensor electrode 3 is connected with the input of microcontroller 10 by wire 13, the additional capacitor in simultaneously also can preliminary election sensor cluster 11.Described microcontroller 10 can be measured the electric capacity on input.Capacitor assembly can be controlled, and according to the electric capacity of measuring on described wire 13 and 14, realizes being switched on or switched off of capacitor by controlling microcontroller 10.In described capacitor assembly 11 and 12, comprise multiple can single connection or the capacitor connected of entirety.
Shown in Fig. 3, in electrode 2 and 3, produce electric capacity with respect to grounding electrode 20.This electrode is installed can pass through car floor, and approaching user or different grounded parts can produce electric capacity while mixing in measuring range.The electric capacity forming between described measurement electrode 2 and electrode 20 sets with capacitor assembly 12 base load that electric capacity is relevant.Capacitance between described measurement electrode 20 and electrode 3 and the capacitance of assembly 11.
The dielectric of electrode 2 and 3 environment of living in changes, be mainly described electrode 2 and 3 and counter electrode 20 scopes in, basic electric capacity also can change.The for example body part between electrode and measuring range is dirty or be wrapped in salt crystallization, described electrode 2 and 3 can produce another with automobile dry with clean state under different basic electric capacity.Microcontroller 10 records the electric capacity of repetition interval and sets, and that is to say, on capacitor connection device 11 and 12, the condenser paper average in the long period is in required scope.For example the electric capacity between described electrode 2 and electrode 20 can raise under environmental impact, thereby the connection electric capacity of equipment 12 is reduced.In the time that analysis operation moves, measure signal and capacitance variations in the short time, can not impact equipment 11 and 12 preliminary election capacitances.On the contrary, electric capacity can also mate with the mean value in longer a period of time, for example a few minutes.Equipment of the present invention can also be realized signal measurement and analysis and fine setting within the scope of fixed capacity.Can measure at any time the basic electric capacity in prescribed limit by basic electric capacity and the load connected.Therefore the sensitivity of this assembly improved greatly, and meet the requirement that can measure larger capacitance range.
If confirmed motion analysis signal, controller 10 sends a start signal to central vehicle controller 5 by output 25.
Multiple capacitors in framework of the present invention can be used as base load and connect, and only have a capacitor can connect one or two electrode.
Claims (7)
1. for responding to the sensor cluster of automobile action, wherein at least one capacitance sensor (2,3) and a control analysis instrument (4) being connected with sensor electrode, described control analysis instrument can the time dependent electrode capacitance value of calculating sensor, and described control analysis instrument sends confirmation signal according to time situation of change; It is characterized in that,
Described control analysis instrument connects a controllable base load standard package (11,12), make described basic capacitance load and sensor electrode (2 by controlling this assembly, 3) the capacitance measurement load sending connects or disconnects, thereby can measure described base load and connect control analysis instrument (4) the total capacitance load of measuring load structure;
By the control analysis instrument control system base load assembly (11,12) relevant with measuring total load.
2. sensor cluster according to claim 1, wherein base load assembly can produce different connected electric capacity base loads, by controlling the base load that can connect variation.
3. sensor cluster according to claim 1 and 2, is wherein provided with multiple sensor electrodes (2,3), and described multiple sensor electrodes are connected to a base load assembly (11,12).
4. sensor cluster according to claim 3, wherein each sensor cluster has respectively a base load assembly (11,12) separately, and described control analysis instrument is realized respectively and being controlled each base load assembly simultaneously.
5. according to sensor cluster in any one of the preceding claims wherein, described control analysis instrument can calculate the total load mean value of measuring under different time, controls the mean value of base load assembly or selection different time base load.
6. according to sensor cluster in any one of the preceding claims wherein, wherein basic capacitance load appears between sensor electrode and control analysis instrument and ground connection simultaneously.
7. operation sensor detects the method for inductive vehicle action, at least by a capacitance sensor electrodes (2,3) and control analysis instrument (4) being connected with sensor electrode measure the capacitance of time dependent sensor electrode, the instrument of control analysis simultaneously also can send confirmation signal
Step comprises:
Measure a total capacitance load by a control analysis instrument being connected with described sensor electrode;
The total capacitance load measuring contrasts with the load setting value in control analysis instrument;
The capacitance measurement load of electric capacity base load and sensor cluster (2,3) is connected, and the measurement capacitance in the base load of connection and control analysis instrument (4) forms total capacitance load;
Select base load according to the total capacitance load of measuring, the assumed load value of total load and setting is approached.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012102422.7 | 2012-03-21 | ||
| DE102012102422A DE102012102422A1 (en) | 2012-03-21 | 2012-03-21 | Capacitive sensor arrangement for switching a door opening on a motor vehicle and associated method |
| PCT/EP2013/054922 WO2013139637A1 (en) | 2012-03-21 | 2013-03-12 | Capacitive sensor arrangement for switching a door opening in a motor vehicle and associated method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104137419A true CN104137419A (en) | 2014-11-05 |
| CN104137419B CN104137419B (en) | 2019-01-11 |
Family
ID=47844361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380010709.3A Active CN104137419B (en) | 2012-03-21 | 2013-03-12 | Control the capacitance sensing device assembly and corresponding operating method of automobile door open |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2828973B1 (en) |
| CN (1) | CN104137419B (en) |
| DE (1) | DE102012102422A1 (en) |
| WO (1) | WO2013139637A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107925407A (en) * | 2015-08-13 | 2018-04-17 | Iee国际电子工程股份公司 | For the operating method of the capacitive sensor system of vehicle trunk opener and the capacitive sensor system of robust |
| CN113218424A (en) * | 2021-05-25 | 2021-08-06 | 东风电子科技股份有限公司 | Circuit structure for detecting capacitive sensor |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015110323A1 (en) | 2015-06-26 | 2016-12-29 | Huf Hülsbeck & Fürst Gmbh & Co. Kg | Lighting device for a motor vehicle |
| DE102018107478A1 (en) | 2017-09-14 | 2019-03-14 | Huf Hülsbeck & Fürst Gmbh & Co. Kg | Method and evaluation system for evaluating a capacitive sensor in a vehicle |
| DE102018106620A1 (en) | 2018-03-21 | 2019-09-26 | Huf Hülsbeck & Fürst Gmbh & Co. Kg | Capacitive sensor device of a vehicle |
| DE102018106624A1 (en) | 2018-03-21 | 2019-09-26 | Huf Hülsbeck & Fürst Gmbh & Co. Kg | Arrangement for a capacitive sensor device |
| DE102018106623A1 (en) | 2018-03-21 | 2019-09-26 | Huf Hülsbeck & Fürst Gmbh & Co. Kg | Arrangement for a capacitive sensor device of a vehicle |
| DE102018106622A1 (en) | 2018-03-21 | 2019-09-26 | Huf Hülsbeck & Fürst Gmbh & Co. Kg | Arrangement for a capacitive sensor device |
| EP3869691A1 (en) * | 2020-02-21 | 2021-08-25 | Semtech Corporation | Time-averaged proximity sensor |
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2012
- 2012-03-21 DE DE102012102422A patent/DE102012102422A1/en active Pending
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2013
- 2013-03-12 EP EP13708467.9A patent/EP2828973B1/en active Active
- 2013-03-12 CN CN201380010709.3A patent/CN104137419B/en active Active
- 2013-03-12 WO PCT/EP2013/054922 patent/WO2013139637A1/en active Application Filing
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| US5730165A (en) * | 1995-12-26 | 1998-03-24 | Philipp; Harald | Time domain capacitive field detector |
| EP1339025A1 (en) * | 2002-02-20 | 2003-08-27 | Kiekert Aktiengesellschaft | Release trigger |
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| WO2010095513A1 (en) * | 2009-02-20 | 2010-08-26 | アルプス電気株式会社 | Proximity capacitance detecting circuit and capacitive sensor module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107925407A (en) * | 2015-08-13 | 2018-04-17 | Iee国际电子工程股份公司 | For the operating method of the capacitive sensor system of vehicle trunk opener and the capacitive sensor system of robust |
| CN107925407B (en) * | 2015-08-13 | 2022-04-05 | Iee国际电子工程股份公司 | Method of operating a capacitive sensor system for a vehicle trunk opener and robust capacitive sensor system |
| CN113218424A (en) * | 2021-05-25 | 2021-08-06 | 东风电子科技股份有限公司 | Circuit structure for detecting capacitive sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104137419B (en) | 2019-01-11 |
| WO2013139637A1 (en) | 2013-09-26 |
| EP2828973A1 (en) | 2015-01-28 |
| EP2828973B1 (en) | 2020-01-08 |
| DE102012102422A1 (en) | 2013-09-26 |
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